Eccentric deeding mechanism



May 8, 1923. 1,454,472

W. J. GUILD ECCENTRI C FEEDING MECHANISM Filed April 6, 1921 2Sheets-Sheet 1 www- May 8, 1923.

W. J. GUILD ECCENTRIC FEEDING MECHANISM Filed April 6, 1921 2Sheets-Sheet 2 Patented May 8 1923.

UNITED, STATES PATENT OFFICE.

WALDO J. GUILD, OF WORCESTER, MASSACHUSETTS, ASSIG-NOR TO HEALD MACHINECOMPANY, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF EIASSACHUSETTS.

ECCENTRIC FEEDING MECHANISM.

Application filed April 6,

T aZZ whom it. may, concern:

Be it known that I, lVALDo J. GUILD, a citizen oi the United States,residing at Worcester. in the county of Worcester and State ofMassachusetts, have invented a new and useful Eccentric FeedingMechanism, of which the following is a specification.

This invention relates to an internal grinding machine of the type inwhich the work does not rotate but the grinding wheel is moved insidethe work in a circular path eccentric to its own axis.

My invention relates particularly to improved means for adjusting theeccentricity of the wheel spindle, being in the nature of an improvementover the construction shown in my prior Patent No. 1,361.850 patentedDecember 1 1, 1920.

It is the object of my present invention to provide improved adjustingmechanism which may be safely operated while the ma chine is in motionand by which the eccentricity of the wheel spindle may be quickly andaccurately adjusted.

A further object is to provide mechanism for this purpose in which allparts are so constructed as to provide ample strength.

My invention further relates to arrangements and combinations of partsto be hereinafter described and more particularly pointed out in theappended claims.

A preferred form of my invention is shown in the drawings in which- Fig.1 is a side elevation of the wheel head of an internal grinding machine;

Fig. 2 is an end elevation of the wheel head, taken along the line 22 inFig. 1;

Fig. 3is a plan view of the wheel head, certain parts being shown insection;

Fig. 4 is a transverse sectional elevation, taken along the line 4l4inFig. 3, and

Fig. 5 is a side elevation of certain parts, taken along the line 55 inFig. 3.

Referring to the drawings, I have show 7 parts of an internal grindingmachine comprising a frame 10 having bearings 11 and 12 for a rotatableouter sleeve or supporting member 13. The member 13 may be contin uouslyrotated in any convenient manner as by a gear 14 engaged by a pinion 15on a belt driven shaft 16.

An inner member 17 (Fig. 3) is eccentrically mounted in the outer member13 and is provided with an eccentrieally positioned bearing for thewheel spindle 18. Reference vention, which relates specifically toimproved devices for thus adjusting the eccentricity of the spindle 18.For this purpose I provide a gear mechanism comprising in part a largegear 20 mounted to rotate with the-member 13 and gear 14: previouslydescribed. The gear 20 meshes with a' pinion 21 on a short shaft 22rotatable about a fixed center.

A second large gear 23 is mounted for tree rotation on the end of themember 13, and internal gear 242 is formed integral therewith and mesheswith a spur gear 25 fined to the end of the inner member 17.

Rotation of the large gear 23 relative to the member 13 will evidentlycause corresponding angular movement of the inner member 17, thusadjusting the eccentricity of the spindle. A stop pin 26 in the gear 25is adapted to engage pins 27 and 28 in the end of the member 13, thuslimiting the angular movement of the inner member to 130. Furthermovement in either direct-ion is useless,

as it will merely reverse the adjustment and will not give additionalrange.

The gear 23 meshes with a pinion 30 (Fig. 3) mounted on the end of a.short shaft 31 rotatable in alignment with the shaft 22 previouslydescribed. The shafts 22 and 31 are preferably mounted to turn inflanged sleeves 32 and 33 which, in turn, are rotatable in fixedbearings 3 and 35. A ring 36 is fixed between the flanges ofthe sleeve32 and 33 and has an eccentric bearing therein for a pair of internalgears 37 and 33- The gear 37 meshes with a spur gear 39 on the end ofthe shaft 22 and the gear 38 meshes with a .spurgear 40 on the end ofthe shaft 31. A spiral gear 41 is formed on the sleeve 33 and engages acorresponding gear l2 on the shaft 43 (Fig. 5) having a hand wheel asthereon.

While the gear trains connecting the large gears let and 23 to theinternal gears 37 and 33 comprise gears of different sizes, thecombinedratio in each case is the same, so that the gear 23 will bedriven at the same speed as the gear 20 so long as no movement of thehand wheel M: occurs. In the example shown in the drawings, the gear 20has 140 teeth, the vgear 21 has 4L0 teeth, the gear .39 hasflS teeth andthe gear 37 has 56 teeth. Similarly, the gear 23 has 141 teeth, the gearhas 39 teeth, the gear has 39 teeth and the gear 38 has 47 teeth, ineach case giving a ratio from 1 to 3 between a large gear and itsconnected internal gear.

So long therefore as no angular adjustment of the ring 36 occurs, thegear 23 will rotate at the same speed as the gear 14 and consequently atthe same speed as the gear 25 on the end of the member 13. Any angularmovement of the ring 36, however, caused by adjustment of the hand wheel44-, will result in a differential movement of the gear 23 relative tothe gear 20 and will cause a slight angular adjustment of the innermember 17 in the outer member 13. In this manner the eccentricity of thespindle may be easily and safely adjusted while the machine is inmotion. The provision of the internal gears 37 and 38 is of particularimportance as it allows the meshing of many teeth between these gearsand the spur gears 39 and 40, and prevents the possibility of injuringthe mechanism when adjustment is made.

Suitable mechanical means may also be provided for turning the shaft4:3, as clear ly disclosed in my prior patent.

Having thus described my invention it will be evident that changes andmodifications may be made therein by those skilled in the art within thespirit and scope of my invention as set forth in the claims and I do notwish to be otherwise limited to the details herein disclosed but what Ido claim is I 1. In an internal grinding machine, a wheel spindle, abearing member in which said spindle is eccentrically mounted, arotatable member in which said bearing memher is eccentrieally mounted,and means to adjust the eccentricity of said bearingmem" her in saidrotatable member, said means including a pair of internal gears havingdifferent numbers of teeth, connections from said gears to saidrotatable member and to said bearing. member respectively, a carrier inwhich said internal gears are eccentrically mounted, and means toangularly adjust said carrier.

2; An internal grinding'machinehaving in combination a wheel spindle aninner member in which said spindle is eccentrically and r0- t-atablymounted, an outer member in which said inner member is eccentricallymounted, a supporting bearing for said outer member, means toindependently rotate said outer member and said wheel spindle, and meansto angularly adjust said inner member in said outer member, said meanscomprising a first gear rotating in fixed speed relation to said outermember, a second gear mounted to rotate freely about the axis of saidouter member, a positive gear connection between said second gear andsaid inner eccentric member, and driving connections between said firstand second gears, said connections comprising a pair of aligned shafts,pinions fixed to said shafts and engaging said first and second gearsrespectively, gears of unequal size also fixed to said shafts, internalgears of unequal size engaging said latter gears, a carrier in whichsaid internal gears are mounted to retate together, and means toangularly adjustsaid carrier.

3. An internal grinding machine having, in combination, a wheel spindle,an inner member in which said spindleis eccentrically and rotatablymounted, an outer member in which said inner member is eccentricallvmounted, a supporting bearing for sai outer member, means toindependently rotate said outer member and said wheel spindle, and meansto angularly adjustsaid inner member in said outer member, said meanscomprising a first gear rotating in fixed speed relation to said outermember, a second gear mounted to rotate freely about the axis of saidouter member, a positive gear connection between sa-id second gear andsaid inner eccentric member, and driving connections between said firstand sec 0nd gears, said connectit'ins comprising a pair of alignedshafts, pinions fixed to said shafts and engaging said first and secondgears respectively, gears of unequal size also fixed to said shaftsatthe adjacent ends thereof, a pair of internal gears rotatable as a unitand meshing with said'latter gears, a carrier rotatable about the axisof said shafts and in which said internal gears are eccentrically androtatably mounted, and means to rotate said carrier whereby theeccentricity of said spindle may be varied;

In testimony whereof I have hereunto aflixed my signature.

VVALDO J. GUILD.

